was planned to determine the nature of guava leaf spot and the role of some fungicides on management of the disease . NUTRITIONAL IMPORTANCE 24. Sheath rot Gaeumannomyces graminis: Shuck rot Myrothecium gramineum: Silage mold Monascus purpureus. The guava (Psidium guajava L., Myrtaceae), is one of 150 species of Psidium most of which are fruit bearing trees native to tropical and subtropical America. Selenophoma leaf spot Selenophoma sp. Algal leaf spot lesions on guava foliage ‹ › × Symptoms. Symptoms; Causal Organism; Disease Cycle and Epidemiology; Management This disease is exceptionally severe in guava. (Misra and Prakash, 1990). The spots develop into oval to elongate reddish-brown powdery and elevated lesions that contain a powdery mass of orange to reddish-brown spores on the upper and lower leaf surfaces. Anthracnose. Authors: Víctor A. González Hernández . A fungal-specific toxin that is responsible for much of the necrosis produces the halo. Bipolaris maydis … Handbook of Plant Disease Identification and Management presents the fundamentals of plant diseases identification based on symptomology and management focusing mainly on integrated pest management approach. CAUSAL ORGANISM Phytophthora nicotiana var. SYMPTOMS: Of the leaf-spotting organisms reported on F. sellowiana (4), the fungus Pseudocercospora feijoae appears to be the most common in Florida. Pseudocercospora Leaf Spot. Pseudocercospora angolensis . Authors: Elías Hernández Castro . Wilt is one of the most destructive diseases of guava January 2019; Plant Disease 103(5); DOI: 10.1094/PDIS-08-18-1328-PDN 3 Cephaleuros parasiticus as a parasite of guava leaves and fruit in Hawaii, causing a leaf and fruit spot disease Fig. Algal leaf and fruit spot (Cephaleuros virescens Kuntze) Disease symptoms: Alga infects immature guava leaves during early spring flush. Symptoms; Causal Organism; Disease Cycle and Epidemiology; Management Fruit lesions are usually smaller than leaf spots. Scabs were formed on heavily infected fruits. race 3. Google Scholar. spot, leaf blight, anthracnose, red rust, sooty mould, rust, seedling blight and damping off etc. Northern leaf spot (=Helminthosporium leaf spot) Causal organism: Cochliobolus carbonum Nelson, Ascomycotina . 11 Mushroom root rot fruiting bodies Symptoms. It discusses a variety of techniques for the diagnosis of crop disease, losses due to crop diseases, and theories behind disease management. Anurag Kerketta CHRS, Jagdalpur Diseases of Guava 2. Authors: Manuel Nava Jaimes . The spots on young leaves can appear as early as 36–48 hours after infection. spot, leaf blight, anthracnose, red rust, sooty mould, rust, seedling blight, damping off, etc. A species ofPhomopsis was constantly associated with this rot and later pathogenicity tests proved this fungus to be the causal organism. Guava Rust. USE PLANTIX NOW! Raised, tumor-like growth with yellow halo on young fruits. Morphological and physiological characters of Myxosporium psidii, the causal organism of guava wilt. The bacteria splash onto leaves or overwinter on plant debris in soil. Table of Contents: Guava Diseases Caused by Fungi and Stramenopiles. 3.1.1 Causal Organism. 1 Anthracnose of guava fruit Fig. The causal organism is Cephaleuros virescens, a green parasitic alga whose usual hosts are plants with leathery leaves such as cotoneasters, magnolias, hollies, rhododendrons and viburnums.Algal leaf spot is sometimes called green scurf because the spots may have a crusty, fuzzy or flaky appearance. Brown spot disease of soybean caused by Septoria sp. Guava Diseases Caused by Fungi and Stramenopiles. Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. Guava. Fruit infection by alga is not common on fruits. The pathogenicity of the causal organism is different from that of redtop. The pathogen extends between cuticle and epidermis and penetrates the epidermal cells. Anthracnose guava rust Guava rot ALGAL LEAF SPOT 23. Causal organism: Cephaleuros virescens. On young leaves, lesions first appear as small brown to black spots, which soon become surrounded by yellow halos . 7 Guava rust symptoms on fruit Fig. These may be crowded or scattered. Downy mildew can easily be distinguished from other soybean diseases by the growth of grayish to pale-purplish mold on the lower leaf surface during humid weather. Growth Kinetics of Vegetative and Reproductive Organs of Guava (Psidium guajava L.) in Iguala Guerrero, Mexico . Jain, S.S. 1956. Circular, mostly isolated spots appear on leaves and can reach up to 10 mm in diameter. Google Scholar. Spot-causing fungal disease occurring from the end of summer to autumn in Hokkaido. CAUSAL ORGANISM Colletotrichum gloeosporioides (teleomorph: Glomerella ... Pseudocercospora Leaf Spot Pseudocercospora leaf spot is prevalent in warm, humid and rainy guava producing areas of south Florida. PSEUDOCERCOSPORA LEAF SPOT OF FEIJOA1 N. E. EI-Ghol2l, 2T. Guava Diseases; Fig. Indian Journal Horticulture, 13: 102–104. Small lesions (2–8 mm) appear as irregular to sub-circular, dark smokey brown on the upper leaf surface, with a darker brown, diffuse border. Diseases of Guava 1. Pseudocercospora leaf spot is prevalent in warm, humid and rainy guava producing areas of south Florida. Plant Protection Bulletin, Taiwan, 18: 309–317. The alga produces specks or big patches on the leaves. Monascus ruber. Pseudocercospora Leaf Spot. Fungus. 9.2 Causal organism This leaf spot is caused by Pestalotia jodhpurensis. During 2014–2015, algal spot disease was noticed in the guava orchards of northern and southern Thailand. Symptoms. Flat lesions, with sunken brown center on older fruit. Spot is a definite, localized, round to regular lesion, often with a border of a different colour, characterized by its location (leaf spot, fruit spot) and colour (brown spot, black spot). J. Appl. Minute, shallow brown velvety lesions appear on leaves specialy on leaf tips, margins or areas near the mid vein and as the disease progresses, the lesions enlarge to 2-3 mm in diameter. 892. The paper deals with investigations on the stylar end rot of guava fruits. Alternaria brown spot attacks leaves, twigs, and young fruit. In a Nutshell. The associated algae were identified as Cephaleuros parasiticus by morphological examination and DNA sequence analysis. Fruits in the orchard as well as in storage suffer with this disease, which is, however, of rare occurrence. The causal organism of sugarcane leaf blight and the taxonomic status of the pathogen involved were, therefore, reinvestigated. 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